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The Diocese of Bayonne, Lescar, and Oloron, commonly Diocese of Bayonne, (Latin: Dioecesis Baionensis, Lascurrensis et Oloronensis; French: Diocèse de Bayonne, Lescar et Oloron; Basque: Baionako, Leskarreko eta Oloroeko elizbarrutia) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in France. It is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Bordeaux. The diocese comprises the département of Pyrénées-Atlantiques, in the région of Nouvelle-Aquitaine.
Its cathedral, the Cathédrale Notre-Dame in Bayonne is a World Heritage Site. Elsewhere in Aquitaine, the diocese contains two former cathedrals: the Ancienne cathédrale Notre-Dame de the Assumption, in Lescar; and the Ancienne cathédrale Sainte-Marie, in Oloron-Sainte-Marie.